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1,896 results for “call”
Data from: Towards the automatic classification of avian flight calls for bioacoustic monitoring
Automatic classification of animal vocalizations has great potential to enhance the monitoring of species movements and behaviors. This is particularly true for monitoring nocturnal bird migration, where automated classification of migrants' flight calls could yield new biological insights and conservation applications for birds that vocalize during migration. In this paper we investigate the automatic classification of bird species from flight calls, and in particular the relationship between two different problem formulations commonly found in the literature: classifying a short clip containing one of a fixed set of known species (N-class problem) and the continuous monitoring problem, the latter of which is relevant to migration monitoring. We implemented a state-of-the-art audio classification model based on unsupervised feature learning and evaluated it on three novel datasets, one for studying the N-class problem including over 5000 flight calls from 43 different species, and two realistic datasets for studying the monitoring scenario comprising hundreds of thousands of audio clips that were compiled by means of remote acoustic sensors deployed in the field during two migration seasons. We show that the model achieves high accuracy when classifying a clip to one of N known species, even for a large number of species. In contrast, the model does not perform as well in the continuous monitoring case. Through a detailed error analysis (that included full expert review of false positives and negatives) we show the model is confounded by varying background noise conditions and previously unseen vocalizations. We also show that the model needs to be parameterized and benchmarked differently for the continuous monitoring scenario. Finally, we show that despite the reduced performance, given the right conditions the model can still characterize the migration pattern of a specific species. The paper concludes with directions for future research.
FIGURE 1 in First description of the advertisement call of the rare treefrog Aplastodiscus flumineus (Cruz and Peixoto, 1985) (Anura: Hylidae: Cophomantinae)
FIGURE 1. Dorsolateral view of a recorded male of Aplastodiscus flumineus, ZUFRJ 15550 (A); and spectrogram (above) and oscillogram (below) of a sequence with three advertisement calls (B); and a single advertisement call (C).
Data from: Tradeoffs in moving citizen-based anuran call surveys online during the SARS-CoV-2 pandemic: lessons from rural Appalachia, USA
<p>Citizen science approaches provide adaptable methodologies for enhancing the natural history knowledge of understudied taxa and engaging underserved populations with biodiversity. However, transitions to remote, virtual training and participant recruitment in response to public health crises like the SARS-CoV-2 pandemic have the potential to disrupt citizen science projects. We present a comparison of outputs from a citizen science initiative built around call surveys for the Mountain Chorus Frog (<i>Pseudacris brachyphona</i>), an understudied anuran, in Appalachian Virginia, USA prior to and during the SARS-CoV-2 pandemic. A transition to virtual training in this initiative did not lead to a decrease in scientific output and led to unexpected natural history insight about our focal taxon; however, a reliance on virtual instruction did decrease overall participation by local residents, particularly for rural K-12 students. We discuss the tradeoffs exhibited by the adaptation of our initiative to a virtual format and provide recommendations for other citizen science initiatives facing similar restrictions in the face of current and future public health crises.</p>
Data from: Differences in distress: variance and production of American crocodile (Crocodylus acutus) distress calls in Belize
Acoustic communication of American Crocodiles (Crocodylus acutus) is relatively understudied. Our overall aim was to determine the acoustic structure of wild American Crocodile distress calls, distinguish call differences among size classes (hatchling, juvenile, sub-adult, and adult), and investigate call production on a gradient of human disturbance. American Crocodile distress calls have strong frequency modulation and are comprised of multiple harmonics in a downsweeping pattern. Measured parameters (total duration, first quartile duration, maximal frequency, first quartile frequency, end frequency, slope of first quartile, slope of last quartiles) differed significantly among size classes (P < 0.05). Hatchling distress calls are higher in frequency and strongly modulated, whereas calls produced by sub-adults and adults showed little modulation, are lower in frequency, and have greater overall duration. Proportion of crocodiles that produced distress calls during capture differed by size class and sampling location, particularly adult distress calls which are reported here to be produced with undocumented frequency. We determined that American Crocodiles of all size classes produce distress calls at varying rates among study sites. Our results demonstrate that American crocodiles produce distress call more frequently at sites with higher anthropogenic activity. Measured call parameters of juveniles and hatchling American crocodiles also varied among sites in relation to human disturbance. Calls recorded at sites of high anthropogenic impact have increased duration and less modulation which may adversely affect response to emitted distress calls. Proportional and call parameter variances suggest anthropogenic activity as a driver for increased call production and alteration of call parameters at high human-impacted sites.
Figure 6 in A comparative study of the mating call of Pelophylax ridibundus and Pelophylax kurtmuelleri (Anura: Ranidae) from syntopic and allotopic populations
Figure 6. Distribution pattern of calls for locality Kresna. Circle indicates group kurtmuelleri; square - ridibundusa; asterisk - ridibunduss.
Figure 4 in A comparative study of the mating call of Pelophylax ridibundus and Pelophylax kurtmuelleri (Anura: Ranidae) from syntopic and allotopic populations
Figure 4. Distribution pattern of calls for locality Rupite. Circle indicates group kurtmuelleri; square - ridibundusa; asterisk - ridibunduss.
Figure 5 in A comparative study of the mating call of Pelophylax ridibundus and Pelophylax kurtmuelleri (Anura: Ranidae) from syntopic and allotopic populations
Figure 5. Distribution pattern of calls for locality Damianitsa. Circle indicates group kurtmuelleri; square - ridibundusa; asterisk - ridibunduss.
Figure 3 in A comparative study of the mating call of Pelophylax ridibundus and Pelophylax kurtmuelleri (Anura: Ranidae) from syntopic and allotopic populations
Figure 3. Distribution pattern of calls based on call characteristics. Circle indicates group kurtmuelleri; square – ridibundusa; asterisk – ridibunduss.
Figure 3 in Morphological reply to a DNA call: a new cryptic species of Hydraena from western Europe, with a complete overview of the Hydraena gracilis complex (Coleoptera: Hydraenidae: "Haenydra" lineage)
Figure 3. Comparative morphology of the Hydraena gracilis complex. Aedeagi in right side view of: (A) Hydraena crepidoptera (from Jäch 1995: Turkey, Sinop, W Yenikonak); (B) Hydraena nike (Greece, Samothraki); (C) Hydraena gracilis (Austria, Niederösterreich); (D) Hydraena gracilidelphis (Spain, León, Puerto de Panderrueda); (E) Hydraena graciloides (Turkey, Bolu, Yödigoller N. P.); (F) Hydraena elisabethae (From Jäch 1995: Greece, Thassos); (G) Hydraena anatolica (Turkey, Kastamonu, Küre Daglari). Scale bar 0.25 mm.
Figure 1 in Morphological reply to a DNA call: a new cryptic species of Hydraena from western Europe, with a complete overview of the Hydraena gracilis complex (Coleoptera: Hydraenidae: "Haenydra" lineage)
Figure 1. Aedeagi in right side view of (A) Hydraena gracilidelphis sp. nov. (Spain, León, Puerto de Panderrueda) and (B) Hydraena gracilis (Austria, Niederösterreich). (C) Female elytral terminations of: H. gracilidelphis sp. nov. (Spain, León, Puerto de Panderrueda); (D) H. gracilis (Italy, Friuli, Stregna). Scale bar 0.25 mm; female elytral terminations not scaled.
Figure 2 in Morphological reply to a DNA call: a new cryptic species of Hydraena from western Europe, with a complete overview of the Hydraena gracilis complex (Coleoptera: Hydraenidae: "Haenydra" lineage)
Figure 2. Map of the geographic distribution of Hydraena gracilidelphis sp. nov. The green spot represents type locality.
Figure 3 in Description of the advertisement and distress call of Chacophrys pierottii and comments on the advertisement call of Lepidobatrachus llanensis (Anura: Ceratophryidae)
Figure 3. (A) One note oscillogram (above) and audiospectrogram of the Lepidobatrachus llanensis advertisement call, recorded at La Patria, Pocho department, Córdoba province, Argentina. Recorded on 12 December 2008; 23.00 h; air temperature 20◦ C. (B) One note oscillogram (above) and audiospectrogram of Ceratophrys cranwelli advertisement call recorded at Añatuya, Santiago del Estero province, Argentina. Recorded on 4 February 2004; air temperature 23◦C.
Figure 2 in Description of the advertisement and distress call of Chacophrys pierottii and comments on the advertisement call of Lepidobatrachus llanensis (Anura: Ceratophryidae)
Figure 2. Oscillogram and audiospectrogram of the distress call of Chacophrys pierottii from el Quicho, Cruz del Eje department, Córdoba province, Argentina. Recorded on 14 December 2008; air temperature 22◦C.
Figure 1 in Description of the advertisement and distress call of Chacophrys pierottii and comments on the advertisement call of Lepidobatrachus llanensis (Anura: Ceratophryidae)
Figure 1. (A) Oscillogram of four notes (above) and one note oscillogram and audiospectrogram of the advertisement call of Chacophrys pierottii recorded at El Quicho, Cruz del Eje department, Córdoba province, Argentina. Recorded on 12 December 2008; 23.00 h; air temperature 20◦C. (B) Oscillogram of two notes (above) and one note audiospectrogram detail showing a variation in the structure of the advertisement call of Chacophrys pierottii registered in two individuals at el Quicho, Cruz del Eje department, Córdoba province, Argentina.
Figure 4 in Reproductive aspects of Leptodactytus hylaedactylus (Anura: Leptodactylidae), a member of the Leptodactylus marmoratus species group, with a description of tadpoles and calls
Figure 4. Leptodactylus hylaedactylus tadpole at stage 35 (Gosner 1960). (A) Lateral view; (B) dorsal view; (C) oral disc of individual from lot INPA-H 19793.
Figure 1 in Reproductive aspects of Leptodactytus hylaedactylus (Anura: Leptodactylidae), a member of the Leptodactylus marmoratus species group, with a description of tadpoles and calls
Figure 1. Hourly patterns of calling activity of males of Leptodactylus hylaedactylus along four transects at the Universidade Federal do Amazonas campus, Manaus, Amazonas. Figures represent mean number ± standard deviation of calling males.
Figure 3 in Reproductive aspects of Leptodactytus hylaedactylus (Anura: Leptodactylidae), a member of the Leptodactylus marmoratus species group, with a description of tadpoles and calls
Figure 3. Oscillogram (top), spectrogram (middle) and power spectrum (bottom) of the territorial call of Leptodactylus hylaedactylus from Reserva Ducke, Manaus, Amazonas (recorded on 16 December 2005, at 10:14 h; air temperature 24o C; call file: Adenomera sp área aberta canto 030 Reserva Ducke_Manaus_AM).
Figure 2 in Reproductive aspects of Leptodactytus hylaedactylus (Anura: Leptodactylidae), a member of the Leptodactylus marmoratus species group, with a description of tadpoles and calls
Figure 2. Oscillogram (top), spectrogram (middle) and power spectrum (bottom) of the advertisement call of Leptodactylus hylaedactylus from Reserva Florestal Adolpho Ducke, Manaus, Amazonas (recorded on 17 December 2005, at 21:42 h; air temperature 22o C; call file: Adenomera hylaedactyla canto 040 parte 1_Reserva Ducke_Manaus_AM).
FIGURE 14. Heleioporus a. flavopunctatus subsp. nov. aggressive call and distress call. A in Taxonomic revision of south-eastern Australian giant burrowing frogs (Anura: Limnodynastidae: Heleioporus Gray)
FIGURE 14. Heleioporus a. flavopunctatus subsp. nov. aggressive call and distress call. A) Distress call from Broadwater State Forest NSW, and B) Aggressive call from Broadwater State Forest, NSW.
FIGURES 160B–163. Male calling song. 160—P in Poecilimon bosphoricus group (Orthoptera, Phaneropterinae): iteration of morpho-taxonomy by song characteristics 3225
FIGURES 160B–163. Male calling song. 160—P. turcicus (Greece: A-Mytillini, Turkey: B-Kırklareli), 161—P. turciae (Turkey: Çanakk-ale), 162— P. heinrichi (Bulgaria: Strandzha), 163—P. proximus (Turkey: Bolu).
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.